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Finding the Fourth Proportional to 718.38, 1,078.61 and 445.59

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Solution

The fourth proportional to 718.38, 1,078.61 and 445.59 is: 669.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.38 : 1,078.61 = 445.59 : x
  2. Step 2: Convert to fraction form
    718.38/1,078.61 = 445.59/x
  3. Step 3: Cross multiply
    718.38x = 1,078.61 × 445.59
  4. Step 4: Simplify right side
    718.38x = 480,615.60
  5. Step 5: Solve for x
    x = 480,615.60/718.38
  6. Step 6: Final answer
    x = 669.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.